Vary image issue

When you generate an image using any model, in this case with firefly 4, then place on a board, select the image and click vary, it is stuck on the Flux model and charges 45 creits all the time, I cannot find a way to change the vary model to firefly.
I have tried in Firefox and Chrome, created new boards, I have refreshed, regenerated with different moels and the issue persists.